Compositions: coating or plastic – Coating or plastic compositions – Carbohydrate or derivative containing
Patent
1974-10-02
1976-07-06
Welcome, Joan E.
Compositions: coating or plastic
Coating or plastic compositions
Carbohydrate or derivative containing
106 1, 106 26, 106184, 106185, 106193J, 106193M, 106195, 106197R, C08K 511, C08L 120, C08L 118, C09J 304
Patent
active
039679730
ABSTRACT:
Sealing glass paste for sealing the face plate and funnel portion of a color television tube wherein PbO-containing sealing glass frit contains from at least 0.1 to 1.5% by weight of Pb.sub.3 O.sub.4 powder, which powder prevents the reduction of PbO to Pb metal during the sealing process, which reduction would otherwise result in a dielectric breakdown in the seal. A sealing glass paste consisting essentially of a PbO--B.sub.2 O.sub.3 --ZnO sealing glass frit and containing from at least 0.1 to 1.5% by weight of Pb.sub.3 O.sub.4 powder, based upon the weight of the frit, together with hydroxypropyl cellulose binder for the frit and a solvent for the binder. A method for sealing the face plate of a color television tube to its funnel portion with a PbO-containing solder glass wherein the reduction of PbO to metallic lead during the sealing step is obviated by the addition of a sufficient amount of Pb.sub.3 O.sub.4 powder in the solder glass and paste made therewith, which Pb.sub.3 O.sub.4 is slowly reduced to PbO in a reducing atmosphere during the sealing of the television tube components. A method for increasing the dielectric properties of a PbO-containing sealing glass paste and the devitrified seal made therefrom, which seals the face plate to the funnel of a color television tube, to a value greater than that provided by the solder glass, per se, by incorporating in the solder glass and the solder glass paste made therefrom a small but sufficient amount of Pb.sub.3 O.sub.4 to accomplish this purpose. A vehicle for a glass frit comprises hydroxypropyl cellulose as a binder and a solvent for said binder.
REFERENCES:
patent: 3198645 (1965-08-01), Plunquian
patent: 3236702 (1966-02-01), Sapiego
patent: 3278521 (1966-10-01), Klug
patent: 3639310 (1972-02-01), Andrews
patent: 3772049 (1973-11-01), Blanco et al.
patent: 3854969 (1974-12-01), Zwahlen
Francel Josef
King James E.
Woulbroun John M.
Dence R. B.
Holler E. J.
Owens--Illinois, Inc.
Welcome Joan E.
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